Use arena allocation for profiles

By using our arena allocator we can madvise the memory used during
profile processing right way. jemalloc may defer the release based on
unpredictable native allocation.

The other advantage of arenas is a much simpler way to measure the
memory needed by profiles.

Test: m test-art-host
Test: manual inspection with meminfo and heaptrack
Bug: 37711886

(cherry picked from commit cc3171ab)

This change also squashes 2 fixes on the orginal submit.
(cherry picked from commit 798ba16b)
(cherry picked from commit e6f87cc9)

(partial cherry picked from commit
55232f13 to fix dexdiag formating and
please the bot)

Merged-In: I2066b6654438474c10b17d5d92538a6095748684
Change-Id: I91741229a807c777631ef324fc3f397c9a0c18e3

Bug: 37711886